Let's assume for the moment that you have some ability in manipulating uke's center using kokyu. I have already elucidated the principles involved in previous posts, as have others. Now simply reverse the role - you as uke, with your back on the ground, try and find the kokyu path thru nage's seated center and off balance them. So, rather than give you the answer, perhaps you could tell me in your own words what you would do in that situation.

Ok... I have to try this at my next keiko... I suspect this is going to be very difficult... reminds me of the time when I tried to lift uke to a standing position from suwariwaza ryotedori. I still haven't figured that one either...